巴东组岩石能量耗散规律的实验研究  

EXPERIMENTAL STUDY ON ROCK ENERGY DISSIPATION OF THE MIDDLE TRIASSI BADONG FORMATION

作　　者：柴波[1,2] 殷坤龙[3] 李想[1] 

机构地区：[1]中国地质大学环境学院,武汉430074 [2]中国地质大学教育部长江三峡库区地质灾害研究中心,武汉430074 [3]中国地质大学工程学院,武汉430074

出　　处：《工程地质学报》2012年第6期1013-1019,共7页Journal of Engineering Geology

基　　金：国家自然科学基金资助项目(40972184);中央高校优秀青年教师基金(2012049018);教育部长江三峡库区地质灾害研究中心开放基金(TGRC201008)

摘　　要：岩石变形和破坏可以看作能量耗散和释放的过程,基于巴东县城西壤坡库岸巴东组岩石压缩实验数据,利用岩石能量学分析理论,分析了巴东组岩石能量的耗散规律,并探讨了巴东组岩石的破坏模式和库岸斜坡失稳机制。结果表明:(1)压缩试验得到了4类破坏模式,其中楔形剪-张破坏模式的平均能耗最大、沿弱面剪切破坏的能耗最小;(2)峰值前外荷输入能(E1)、峰值前岩块损伤能(ED)及单位长度裂纹耗能率均表明,巴东组岩石在垂向上硬度不均。在构造作用下,岩体内部广泛发育顺层滑脱带;(3)硬度高的岩石常表现为脆性破坏,破裂时能量耗散速度快。硬质岩斜坡在破坏前所集聚的弹性能,远大于破坏时所需的破裂能,易发生剧烈滑动;(4)在矿物成分变化处,巴东组岩石能量分析的各项指标表现出明显的波动,灰质高的岩石强度相对于黏土质高者的强度大。研究成果对于解释巴东组岩石强度特征和巴东城区内滑坡的失稳模式具有参考意义。Rock deformation and failure can be regarded as the process of energy dissipation and release. This pa- per conducts the laboratory test on rocks s samples from Xirangpo banks of Badong town. The rock energy dissipa- tion characteristics of the middle triassi badong formation are analyzed. Furthermore, the paper analyzes the laws of rock energy and discusses the strength characteristics and the failure regularity of bank slope. The paper indicates the follows. （1） By compression test, failure .mode of rock can be divided into four categories. The wedge shear and tensile failure modes have the largest energy consumption rates. The mode of shear failure along weakness face owns the smallest one. （2） the hardness of rock can be characterized by energy of external load input before peak, rock failure and damage energy and unit length of the crack energy consumption rate. The hardness distributes une-venly vertically. The internal part of rock is easy to occur bedding slip under tectonic effects. rock usually performance brittle failure. The failure energy consumption speed is fast before the （3） High strength damage. Hard rock slopes normally concentrate a large number of elastic energy which is much larger than the required energy for rock failure in destruction stage, leading to severe sliding. （4） At the areas of mineral composition changes in rocks, the indicators of rock energy analysis have shown apparent fluctuation. Strength of lime rock is relative higher than clay rock. The results can provide an important reference for interpreting the mechanics character of rock and fail- ure mode of landslides in Badong town.

关 键 词：能量耗散 巴东组岩石 压缩试验 

分 类 号：O319.56[理学—一般力学与力学基础]